Gunna make the .284(7mm) Hammer Hunter 177grains GO FAST!

[The scout]

That is a great hunting setup

[Biggerhammer]

I actually did two reamers for this. A version with a 35 degree shoulder and a 40 degree shoulder. I used the 35 degree shoulder reamer first so if I chose to go with the 40 degree shoulder I could just clean up the existing shoulder. The standard straight neck down version of the 7mm-300 has been around for a long time. Then there is the 7mm-Practical wich is basically a straight 7mm-300 with a few accuracy tweaks. I tried to get as much case capacity as I could by moving the shoulder forward and improving it, along with doing away with as much case tapper as possible. Once I get my cases fireformed and run full house loads. The 7.21 Sage will out run the straight 7mm-300 and the 7mm Practical. Just more of a good thing because the practical is a great cartridge.

I have been kicking around the idea of a “Bore Rider” throat.

Bellow is a link to a  great read and partial basis for my chamber design. Some really cool videos of terminal performance at distance with the 180gr ELD-M. Terminal Ballistics speeds are conservative the guys at Long Range Hunting are getting quite a bit more velocity from a straight .300 Win Mag case necked down to 7mm.

Terminal Ballistics

https://www.ballisticstudies.com/Knowledgebase/7mm+Practical.html

Long Range Hunting thread 7/300 Win Mag

https://www.longrangehunting.com/threads/anyone-own-a-7mm-300-win-mag.51404/

[Biggerhammer]

Had to hunt down the Magnetto Speed. Off to fireform some cases.

One of the rare accusations I have to shoot all day!

[Biggerhammer]

160gr Nosler Accubond.

Worked up from 72.5gr of H1000 to 76gr H1000. I still have room to go higher in charge. 76gr was just the max powder charge I loaded to today.

76gr H1000 160gr Nosler  Accubond.
3264 FPS SD-3.6

Not too shabby considering I’m fireforming. I’ll have more case capacity the next go round.

[Biggerhammer]

Hornady 162gr ELD-X

Worked up to 77gr H1000. 3294fps slightly sticky bolt lift. I’ll try the same charge in a formed case, which has more capacity and work up in .2 grain increments.

[b23]

Are you thinking you'll need to use slower powders like RL33 or N570 when you switch over to shooting the heavies or are you committed to staying with H1000?

[Biggerhammer]

RL-33👍

[yorketransport]

I love the fact that you had to add a screw to hold your bolt handle on. Go Remington!

I learned a long time ago with Remington actions, when it comes to wildcat load development. I may have to knock that bolt open. A $40.00 buck bolt handle screw is way less hassle and time down than breaking off a bolt handle.

That's why I love the Savage system, I can put a new bolt handle on there without removing the bolt. It really helps when you break it off while trying to remove a case that's welded to the chamber. 

That came up when loading what turned out to be a bad batch of Accubonds in a 6.5x284. The starting charge weight of H4831 locked up the action so tight we snapped off the bolt handle trying to open it up back at the house.

[Dan-o]

I love the fact that you had to add a screw to hold your bolt handle on. Go Remington!

I learned a long time ago with Remington actions, when it comes to wildcat load development. I may have to knock that bolt open. A $40.00 buck bolt handle screw is way less hassle and time down than breaking off a bolt handle.

That's why I love the Savage system, I can put a new bolt handle on there without removing the bolt. It really helps when you break it off while trying to remove a case that's welded to the chamber. 

That came up when loading what turned out to be a bad batch of Accubonds in a 6.5x284. The starting charge weight of H4831 locked up the action so tight we snapped off the bolt handle trying to open it up back at the house.

 

[jasnt]

One good reason to go barrel nut

[Biggerhammer]

First three shot group at 300 yards. Fire forming cases.

[Biggerhammer]

Fire formed case 77.1gr H1000 @ 300 yards. 3325 FPS.

Shooting under half MOA. That’s faster than the max load In the Nosler book for a 160gr/28 Nosler (8th Edition) of course Nosler was running’s 26” bbl.

[jasnt]

Bet she tightens up a bit too. 

[Biggerhammer]

Bet she tightens up a bit too.

It should. I have 74 rounds on the barrel and it’s getting a little faster.

[yorketransport]

Aren't you bored with this yet?  You need to hurry up and get a 375 BME up and running.....